Bring cash, some vendors may not accept debit/credit cards. (ATM's are available but, they charge a fee!)

No backpacks are overly large bags will be allowed.

It's going to be very hot down there until the sun sets and pretty warm even after that so, be sure you drink plenty of water. The earlier hours, while the sun's still up, are a great time to check out the attractions inside the Abraham Chavez theater and the Convention Center. Those buildings are loaded with fun stuff to see and they're air conditioned. Water is available, for free, in the Convention Center also.